Learning to speak languages seems to be a very mysterious process.

语言学习似乎是一个非常神秘的过程。

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But learning to speak languages seems to be a very mysterious process.

但是语言学习似乎是一个非常神秘的过程。

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He was being very mysterious about where he was going.

他十分诡秘，闭口不谈他要去哪里。

《牛津词典》

Doctor Cawkwell told VOA that fibromyalgia is a very mysterious disease that has proved difficult to diagnose and treat.

VOA: special.2011.08.02

It's all very mysterious and we send off a spaceship to investigate the markings, the radio signals from the other place.

一切都很神秘,所以我们,派遣一艘飞船去调查星球上的印记,以及那些从其他星球传来的无线电信号

耶鲁公开课 - 死亡课程节选

and that something that happens was often very mysterious, very akin, I think, sometimes to inspiration.

而这种想法，常常是神秘的，有时候，与“灵感“很相似。

普林斯顿公开课 - 人性课程节选

"It used to be a very mysterious thing to travel to Asia, " Boyd says.

FORBES: Magazine Article

Instead, food allergies were considered vague and very mysterious, and hardly anyone was prepared for allergic reactions to foods.

CNN: Food allergy diagnosis: What parents should know

But the inner element of his appeal is very mysterious.

WSJ: Maurizio Pollini: Not as Others See Him | Cultural Conversation by David Mermelstein